<?php
class JSSDK {
  private $appId;
  private $appSecret;   
   private $mysql ;//new一个mysql操作数据库类



  public function __construct($appId, $appSecret) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
  }

  public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();

    // 注意 URL 一定要动态获取，不能 hardcode.
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

    $timestamp = time();
    $nonceStr = $this->createNonceStr();

    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

    $signature = sha1($string);

    $signPackage = array(
      "appId"     => $this->appId,
      "nonceStr"  => $nonceStr,
      "timestamp" => $timestamp,
      "url"       => $url,
      "signature" => $signature,
      "rawString" => $string
    );
    return $signPackage; 
  }

  private function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

  private function getJsApiTicket() {
    // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
      //$data = json_decode(file_get_contents("jsapi_ticket.json"));
    $mysql = new SaeMysql(); 
    $sql = "SELECT * FROM tb_access_token where type='jsapi_ticket' "; //mysql查询语句
    $data = $mysql->getData( $sql ); //执行查询语句并返回结果到变量$data
    $oldticket = $data[0]['access_token'];
    $time = $data[0]['expire_time'];
      
     
      
      if ($time < time()) {
      $accessToken = $this->getAccessToken();
      // 如果是企业号用以下 URL 获取 ticket
      // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = json_decode($this->httpGet($url));
      $ticket = $res->ticket;
      if ($ticket) {
        $time = time() + 7000;
        $sql = sprintf("update  tb_access_token   set access_token='%s', expire_time=%d where type='jsapi_ticket'",$ticket,$time);
      	$mysql->runSql($sql);
        if ($mysql->errno() != 0) //如果有错误进行提示.
        {
            echo "Error2:".$mysql->errmsg();
        }
        else
        {
        	echo "连接成功!";
        }
        $mysql->closeDb(); //关闭连接。
      }
    } else {
          $ticket = $oldticket;
         
    }
	echo "<br/>R2 ".$ticket;
    echo "<br/>".$time;
    return $ticket;
  }

  private function getAccessToken() {
    // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
    $mysql = new SaeMysql(); 
    $sql = "SELECT * FROM tb_access_token where type='access_token' LIMIT 1"; //mysql查询语句
    $data = $mysql->getData( $sql ); //执行查询语句并返回结果到变量$data
      //$data = json_decode(file_get_contents("access_token.json"));
    $oldtoken = $data[0]['access_token'];
    $time = $data[0]['expire_time'];
    if ( $time < time()) {
      // 如果是企业号用以下URL获取access_token
      // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
      $res = json_decode($this->httpGet($url));
      $access_token = $res->access_token;
      if ($access_token) {
        $time = time() + 7000;
        $sql = sprintf("update `tb_access_token`  set access_token='%s', expire_time=%d where type='access_token'",$access_token,$time);
      	$mysql->runSql($sql);
        if ($mysql->errno() != 0) //如果有错误进行提示.
        {
            echo "Error1:".$mysql->errmsg();      
        }
        else
        {
        	echo "连接成功!";
        }
        $mysql->closeDb(); //关闭连接。
      }
    } else {
      	$access_token = $oldtoken;
    }
      echo "<br/>R3 ".$access_token;
            echo "<br/>".$time;
    return $access_token;
  }

  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
  }
}

